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[vsnet-campaign 977] RX J0944.5+0357 long and bright outburst
RX J0944.5+0357 (UG)
RXJ0944.5+0357 20010609.179 143C Scp
RXJ0944.5+0357 20010610.189 131C Scp
RXJ0944.5+0357 20010614.231 138C Scp
Sequence: GSC
Instrument: IRO (0.5-m RCT + AP-8)
This dwarf nova is currently undergoing its second ever recorded outburst.
If RX J0944.5+0357 belongs to the SU UMa subclass then this should be a
supermaximum. The only previously recorded outburst was detected by
Tsutomu Watanabe on 2001 Jan 4.740 UT at mv= 13.2 (cf. vsnet-obs 31518)
(short outburst or final stage of a long one?).
On June 9.179 UT the CV was very probably caught just hours after the onset
of the outburst. An eclipse seems much less likely since S. Kiyota did not
detect any notable fadings during his photometry runs (see below).
Time-resolved photometry is urgently required during the current outburst
(which unfortunately could not have occurred at a much more unfavourable
time of the year).
J2000.0 coordinates: R.A. 09h44m31.762s Decl. +03o58'06.09" (USNO cat.)
Regards,
Patrick
P.S.:
-------------------------------------------------------------------------------
Date: Fri, 5 Jan 2001 15:20:09 +0900 (JST)
From: Taichi Kato <tkato@kusastro.kyoto-u.ac.jp>
To: vsnet-alert@kusastro.kyoto-u.ac.jp, vsnet-campaign@kusastro.kyoto-u.ac.jp
Subject: [vsnet-alert 5518] RXJ0944.5+0357 outburst (+recent data)
RXJ0944.5+0357 outburst (+recent data)
As reported by T. Watanabe-san, the ROSAT-selected cataclysmic variable
RX J0944.5+0357 is seen first time in outburst. The observation seems
to establish its dwarf nova nature. The object has been monitored
since 1999 March, yielding no other outburst (typical limiting magnitude
13.5).
YYYYMMDD(UT) mag observer
20001208.766 <134 (H. Maehara)
20001223.667 <142 (T. Watanabe)
20001225.746 <138 (H. Maehara)
20001227.815 <141 (H. Maehara)
20010104.740 132 (T. Watanabe)
The CV is listed in New CVs from "The Hamburg/RASS Catalogue of Optical
Identifications". The quiescent magnitude is 16.3. (see also [vsnet 1361])
RXJ0944.5+0357 = 094431.8 +035806 (2000.0) 16.3 CV
= USNO0900.06535704 094431.762 +035806.09 (2000.0) 15.3 17.0
Follow-up observations are strongly encouraged. [RZ Leo being of high
priority, a short time-series before the RZ Leo run may be useful].
Regards,
Taichi Kato
VSNET Collaboration team
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Date: Sat, 6 Jan 2001 18:35:36 +0900 (JST)
From: Taichi Kato <tkato@kusastro.kyoto-u.ac.jp>
To: vsnet-alert@kusastro.kyoto-u.ac.jp, vsnet-campaign@kusastro.kyoto-u.ac.jp
Cc: vsnet-newvar@kusastro.kyoto-u.ac.jp
Subject: [vsnet-alert 5526] RX J0944.5+0357 outburst confirmed, time-series
photometry by Kiyota
RX J0944.5+0357 outburst confirmed, time-series photometry by Kiyota
Dear Colleagues,
The first-ever outburst of RX J0944.5+0357, reported by T. Watanabe,
has been confirmed by S. Kiyota (Tsukuba, Japan), who reported
a representative V-magnitude of 14.07 on 2001 Jan. 5.580 UT. He also
reported 2.5-hour time-series photometry, which shows small-amplitude
irregular fluctuations superimposed on a gradual fading. There was no
superhump-like modulation up to an amplitude of 0.1 mag. The object is
likely a long-period system, or the outburst is a normal outburst.
Further observations are encouraged to clarify the nature of the object.
Regards,
VSNET Collaboration team
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Date: Tue, 9 Jan 2001 16:55:52 +0900 (JST)
From: Taichi Kato <tkato@kusastro.kyoto-u.ac.jp>
To: vsnet-campaign@kusastro.kyoto-u.ac.jp
Subject: [vsnet-campaign 667] RX J0944.5+0357 observation by Kiyota-san
RX J0944.5+0357 observation by Kiyota-san
S. Kiyota-san reports further observations of RX J0944.5+0357 on Jan. 5
and 6. The object faded by nearly 1 mag between Jan. 5 and 6. The rapid
fading suggests that the object may be a short-period system, or even
an SU UMa-type star in normal outburst. Future monitoring for outbursts
is strongly encouraged. The data were posted to vsnet-campaig-data 58, 59.
Regards,
VSNET Collaboration team
vsnet-adm@kusastro.kyoto-u.ac.jp
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